Search Publications

Intercalibration of SUMER and CDS on SOHO. I. SUMER detector A and CDS NIS

Solanki, Sami K.; Schühle, Udo; Hollandt, Jörg +6 more

Laboratory Studies of Alkali Metal Filter Deposition, Ultraviolet Transmission, and Visible Blocking

Trauger, John T.; Vincent, Mark B.; Clarke, John T. +4 more

Far-ultraviolet alkali metal or Wood s filters have been produced and tested supporting the production of a flight filter for the Wide Field Planetary Camera 2 on the Hubble Space Telescope. Sodium layers 0.5 1- m thick transmit up to 40% in the ultraviolet while efficiently blocking visible wavelengths. The prevention of visible pinholes is assis…

Radiometric calibration tracking of the vacuum-ultraviolet spectrometer SUMER during the first year of the SOHO mission

Wilhelm, Klaus; Schühle, Udo; Brekke, Pål +3 more

Radiometric calibration of SUMER: refinement of the laboratory results under operational conditions on SOHO

Wilhelm, Klaus; Schühle, Udo; Curdt, Werner +3 more

Polarization sensitivity of the SUMER instrument on SOHO

Lemaire, P.; Hassler, D. M.; Longval, Y.

Hubble Space Telescope Faint Object Camera calculated point-spread functions

Hollis, J. M.; Dorband, J. E.; Lyon, R. G.

A set of observed noisy Hubble Space Telescope Faint Object Camera point-spread functions is used to recover the combined Hubble and Faint Object Camera wave-front error. The low-spatial-frequency wave-front error is parameterized in terms of a set of 32 annular Zernike polynomials. The midlevel and higher spatial frequencies are parameterized in …

Optical performances of the Ultraviolet Coronagraph Spectrometer of the Solar Heliospheric Observatory

Fineschi, Silvano; Romoli, Marco; Naletto, Giampiero +6 more

Performance of high-density cast silicon carbide in the extreme ultraviolet

Keski-Kuha, Ritva A. M.; Fleetwood, Charles M.; Robichaud, Joseph

Radiometric calibration of the telescope and ultraviolet spectrometer SUMER on SOHO

Wilhelm, Klaus; Schühle, Udo; Curdt, Werner +4 more

The prelaunch spectral-sensitivity calibration of the solar spectrometer SUMER (Solar Ultraviolet Measurements of Emitted Radiation) is described. SUMER is part of the payload of the Solar and Heliospheric Observatory (SOHO), which begins its scientific mission in 1996. The instrument consists of a telescope and a spectrometer capable of taking sp…

Performance of ion-figured silicon carbide SUMER telescope mirror in the vacuum ultraviolet

Saha, Timo T.; Leviton, Douglas B.; Glenn, Paul

Measured and theoretical encircled energy and small-angle scatter of the telescope mirror (SST) of the solar ultraviolet measurements of emitted radiation (SUMER) instrument are compared at the wavelength of 123.6 nm. Mirror performance modeling was accomplished with the Optical Surface Analysis Code software package. The modeling is based on meas…